FlightCrew is a C++, cross-platform, native code epub validator.
It is composed of three parts:

* FlightCrew, the validation library;
* FlightCrew-cli, the command-line front-end to the FlightCrew library;
* FlightCrew-gui, the GUI front-end to the FlightCrew library;

Homepage:
https://github.com/Sigil-Ebook/flightcrew
